1 files changed, 135 insertions, 0 deletions
diff --git a/cpu/arm926ejs/mx25/timer.c b/cpu/arm926ejs/mx25/timer.c
new file mode 100644
index 0000000..8b6a061
--- /dev/null
+++ b/cpu/arm926ejs/mx25/timer.c
@@ -0,0 +1,135 @@
+/*
+ * (C) Copyright 2007
+ * Sascha Hauer, Pengutronix
+ *
+ * (C) Copyright 2009 Freescale Semiconductor
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/arch/mx25-regs.h>
+
+#define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
+
+/* General purpose timers registers */
+#define GPTCR	__REG(TIMER_BASE) /* Control register */
+#define GPTPR	__REG(TIMER_BASE + 0x4) /* Prescaler register */
+#define GPTSR	__REG(TIMER_BASE + 0x8) /* Status register */
+#define GPTCNT	__REG(TIMER_BASE + 0x24) /* Counter register */
+
+/* General purpose timers bitfields */
+#define GPTCR_SWR	(1<<15) /* Software reset */
+#define GPTCR_FRR	(1<<9)  /* Freerun / restart */
+#define GPTCR_CLKSOURCE_32	(4<<6)  /* Clock source */
+#define GPTCR_TEN	(1)	/* Timer enable */
+
+static ulong timestamp;
+static ulong lastinc;
+
+static inline void setup_gpt()
+{
+	int i;
+	static int init_done;
+
+	if (init_done)
+	    return;
+
+	init_done = 1;
+
+	/* setup GP Timer 1 */
+	GPTCR = GPTCR_SWR;
+	for (i = 0; i < 100; i++)
+		GPTCR = 0;      /* We have no udelay by now */
+	GPTPR = 0;              /* 32Khz */
+	/* Freerun Mode, PERCLK1 input */
+	GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN;
+}
+
+/* nothing really to do with interrupts, just starts up a counter. */
+int timer_init(void)
+{
+	setup_gpt();
+
+	return 0;
+}
+
+void reset_timer_masked(void)
+{
+	/* reset time */
+	lastinc = GPTCNT; /* capture current incrementer value time */
+	timestamp = 0; /* start "advancing" time stamp from 0 */
+}
+
+void reset_timer(void)
+{
+	reset_timer_masked();
+}
+
+ulong get_timer_masked(void)
+{
+	ulong now = GPTCNT; /* current tick value */
+
+	if (now >= lastinc)	/* normal mode (non roll) */
+		/* move stamp forward with absolut diff ticks */
+		timestamp += (now - lastinc);
+	else			/* we have rollover of incrementer */
+		timestamp += (0xFFFFFFFF - lastinc) + now;
+	lastinc = now;
+	return timestamp;
+}
+
+ulong get_timer(ulong base)
+{
+	return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+}
+
+/* delay x useconds AND perserve advance timstamp value */
+void udelay(unsigned long usec)
+{
+	ulong tmo, tmp;
+
+	setup_gpt();
+
+	if (usec >= 1000) {	/* if "big" number, spread normalize to secs */
+		tmo = usec / 1000;	/* normalize usec to ticks per sec */
+		tmo *= CONFIG_SYS_HZ;	/* find number of "ticks" to wait */
+		tmo /= 1000;		/* finish normalize. */
+	} else {			/* don't kill prior to HZ multiply */
+		tmo = usec * CONFIG_SYS_HZ;
+		tmo /= (1000*1000);
+	}
+
+	tmp = get_timer(0);		/* get current timestamp */
+	if ((tmo + tmp + 1) < tmp)	/* if overflow time stamp */
+		reset_timer_masked();	/* reset "advancing" timestamp to 0 */
+	else
+		tmo += tmp;		/* else, set stamp wake up time */
+	while (get_timer_masked() < tmo)/* loop till event */
+		/*NOP*/;
+}
+
+void reset_cpu(ulong addr)
+{
+	__REG16(WDOG_BASE) = 4;
+}